Planet Minis

79z50420 · 03-08-2008, 11:31 AM

Just wondering what clearance specs to use to bore out my 79z50's cylinder for an over sized piston? The ones that in the manual for stock cylinder ID to piston OD?

firepower354 · 03-08-2008, 01:40 PM

We use .0015.

Option: DrATV has a 49cc marked 85cc kit with jug, piston, rings, and gaskets for $110, not much more than parts and a bore job

79z50420 · 03-08-2008, 05:56 PM

ya i seen that....where i'm in canada the shipping might kill the deal though but i priced all the parts from honda here in town for like 80 plus taxes. I can do the bore job myself since i'm an apprentice machinist plus my dad has a mill in the shop at home but for the extra power it seems worth it. Would i need a bigger carb inorder to run that 85cc cylinder kit?

z50_stunter · 03-10-2008, 01:25 AM

a bigger carb may not be a necessity if you are keeping the stock cam, but a slightly larger carb will allow it to fully rev... but i wouldnt go larger than 18 mm, or you could run into throttle response problems.. you may look into getting a stock xr 70 carb...pricey, but hard to beat

03-08-2008, 11:31 AM	#1 (permalink)
79z50420 PM Newbie Join Date: Nov 2007 Location: East Coast Canada fackers!! Posts: 96	piston to cyl. clearance for cylinder bore Just wondering what clearance specs to use to bore out my 79z50's cylinder for an over sized piston? The ones that in the manual for stock cylinder ID to piston OD?

03-08-2008, 01:40 PM	#2 (permalink)
firepower354 Advertiser Join Date: Oct 2006 Location: Flint MI Posts: 11,002 My Mood:	Re: piston to cyl. clearance for cylinder bore We use .0015. Option: DrATV has a 49cc marked 85cc kit with jug, piston, rings, and gaskets for $110, not much more than parts and a bore job __________________ If it has my name on it I did it;) FirepowerMinis.com Custom FPM parts and engines. Parts and service for all makes. Honda Trail Bikes parts and accessories. Pitster/Piranha/Thumpstar bikes, parts, engines and accessories.

03-08-2008, 05:56 PM	#3 (permalink)
79z50420 PM Newbie Join Date: Nov 2007 Location: East Coast Canada fackers!! Posts: 96	Re: piston to cyl. clearance for cylinder bore ya i seen that....where i'm in canada the shipping might kill the deal though but i priced all the parts from honda here in town for like 80 plus taxes. I can do the bore job myself since i'm an apprentice machinist plus my dad has a mill in the shop at home but for the extra power it seems worth it. Would i need a bigger carb inorder to run that 85cc cylinder kit?

03-10-2008, 01:25 AM	#4 (permalink)
z50_stunter PM Newbie Join Date: Mar 2008 Location: Midland, TX Posts: 36	Re: piston to cyl. clearance for cylinder bore a bigger carb may not be a necessity if you are keeping the stock cam, but a slightly larger carb will allow it to fully rev... but i wouldnt go larger than 18 mm, or you could run into throttle response problems.. you may look into getting a stock xr 70 carb...pricey, but hard to beat

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